What are the factors which stipulate habitualness which is usually conveyed in English by the present simple? For example,
1 He builds houses. She works as a manager. I go to college.
2 I am reading War and Peace. I am building a house. I am studying economics.
If we look at the aforementioned actions in the light of real physical universe, we will see that they can take the same amount of time.
Actions 2 may last as long as actions 1 in reality. Plus, "I go to college" clearly indicates that the action is going to end (as a rule). People, usually, don't go to school, college etc. all their life.
So, why do English speaking people say "I go to college" instead of "I am going to college" if it's clearly understood that "going to college is a temporary action"? /Maybe you will say: because it happens almost every day./ OK. But why do English speaking people not say then "I read war and peace."? Or, why is it not right to say "Today, I call all my friends and wish them all the best". It's a repetitive action which is habitual in terms of one day.
I hope I have managed to get my point across.